Abstract: The present invention provides a light emitting device which comprises blue and red light emitting diode (LED) chips and at least one phosphor for emitting green light by means of light emitted from the blue LED chip, and an LCD backlight including the light emitting device. According to the light emitting device of the present invention, uniform white light can be implemented and both high luminance and wider color reproduction range can also be obtained. Accordingly, an LCD backlight for uniform light distribution on an LCD as well as low power consumption and high durability can be manufactured using the light emitting device.

Abstract: The present invention provides a light emitting device which comprises blue and red light emitting diode (LED) chips and at least one phosphor for emitting green light by means of light emitted from the blue LED chip, and an LCD backlight including the light emitting device. According to the light emitting device of the present invention, uniform white light can be implemented and both high luminance and wider color reproduction range can also be obtained. Accordingly, an LCD backlight for uniform light distribution on an LCD as well as low power consumption and high durability can be manufactured using the light emitting device.

Abstract: The present invention provides a light emitting device which comprises blue and red light emitting diode (LED) chips and at least one phosphor for emitting green light by means of light emitted from the blue LED chip, and an LCD backlight including the light emitting device. According to the light emitting device of the present invention, uniform white light can be implemented and both high luminance and wider color reproduction range can also be obtained. Accordingly, an LCD backlight for uniform light distribution on an LCD as well as low power consumption and high durability can be manufactured using the light emitting device.

Abstract: The present invention relates to a thiogallate phosphor expressed as AB2S4. The thiogallate phosphor of the present invention is configured by replacing a position A where a divalent ion is required with a trivalent element having an ion size similar to that of the element at the position A and with a monovalent element having an ion size similar to that of the element at the position A. Preferably, the trivalent and monovalent elements are replaced by the same amount. Further, the present invention relates to a white light emitting diode and is to manufacture a white light emitting diode with excellent luminous efficiency.

Abstract: A phosphor is formed with a glass coating layer on a surface of a phosphor grain to have improved moisture and/or thermal stability. A method for manufacturing the phosphor comprises preparing phosphor gains excitable by light, and forming a glass coating layer on a surface of each phosphor grain. The glass coating layer may be formed by mixing the phosphor grains with a glass composition; heat-treating a mixture of the phosphor grains and the glass composition to make the glass composition melt and surround the phosphor grains; and cooling and breaking the heat-treated mixture to provide phosphors, each comprising the phosphor grain having the glass coating layer formed on a surface of the phosphor grain.

Abstract: A phosphor is formed with a glass coating layer on a surface of a phosphor grain to have improved moisture and/or thermal stability. A method for manufacturing the phosphor comprises preparing phosphor gains excitable by light, and forming a glass coating layer on a surface of each phosphor grain. The glass coating layer may be formed by mixing the phosphor grains with a glass composition; heat-treating a mixture of the phosphor grains and the glass composition to make the glass composition melt and surround the phosphor grains; and cooling and breaking the heat-treated mixture to provide phosphors, each comprising the phosphor grain having the glass coating layer formed on a surface of the phosphor grain.

Abstract: The present invention provides a red phosphor, a method for manufacturing the red phosphor and a light emitting device using the red phosphor, in which the red phosphor is expressed as a chemical formula of (Ca,Sr)1-x-yEuxPbyS, wherein 0.0005?x?0.01 and 0.001?y?0.05. According to the present invention, the red phosphor has improved reliability and luminous efficiency and thus be used to obtain a light emitting device with more excellent color reproducibility and optical characteristic.

Abstract: The present invention relates to a white light emitting device in which a thiogallate based phosphor capable of emitting green light and an alkaline earth metal sulfide based phosphor capable of emitting red light are arranged on an upper surface of a light emitting diode for emitting ultraviolet rays or blue light such that the mixing of the lights can result in white light with high brightness, and thus, excellent white light with high color purity and color reproducibility after color filtration.

Abstract: The present invention relates to a light emitting device comprising a light emitting diode for emitting blue light or ultraviolet rays, and at least one orthosilicate based phosphor for emitting light in a green to yellow region and an alkaline earth metal sulfide based phosphor for emitting light in a red region which are installed above the light emitting diode. According to the light emitting device of the present invention, white light with a continuous spectrum ranging from green to red can be implemented such that more excellent color rendering and color reproducibility can be obtained. Therefore, the light emitting device of the present invention can used in an liquid crystal display backlight unit as well as a general lighting source and flash light source.

Abstract: The present invention relates to a thiogallate phosphor which is excited by ultraviolet or blue light to emit light with a relatively longer wavelength than that of the ultraviolet or blue light. The phosphor is expressed as a general formula of (A1-x-yEuxMIIIy)(B2-yMIIy)S4, wherein 0.005<x<0.9, 0<y<0.995 and x+y<1. Here, A is at least one element selected from the group consisting of Ba, Sr and Ca, B is at least one element selected from the group consisting of Al, Ga and In, MIII is at least one rare earth element selected from the group consisting of Sc, La, Gd and Lu, and MII is at least one element consisting of Mg, Zn and Be. Accordingly, the luminous efficiency can be increased relative to the thiogallate phosphor with a general formula of AB2S4:Eu.

Abstract: A method of coating phosphor powder with a composite oxide, and a light emitting device that employs the phosphor powder coated with the composite oxide are disclosed. The method includes mixing a silicon oxide precursor and a precursor of another oxide in water and alcohol to form a primary coating layer on a sulfide phosphor through a sol-gel reaction, heat treating the primary coating layer to form a composite oxide layer of the silicon oxide and the other oxide from the primary coating layer. The method improves moisture stability of the sulfide phosphor compared to a sulfide phosphor coated with a single silicon oxide film.

Abstract: A phosphor is formed with a glass coating layer on a surface of a phosphor grain to have improved moisture and/or thermal stability. A method for manufacturing the phosphor comprises preparing phosphor gains excitable by light, and forming a glass coating layer on a surface of each phosphor grain. The glass coating layer may be formed by mixing the phosphor grains with a glass composition; heat-treating a mixture of the phosphor grains and the glass composition to make the glass composition melt and surround the phosphor grains; and cooling and breaking the heat-treated mixture to provide phosphors, each comprising the phosphor grain having the glass coating layer formed on a surface of the phosphor grain.

Abstract: A phosphor is formed with a glass coating layer on a surface of a phosphor grain to have improved moisture and/or thermal stability. A method for manufacturing the phosphor comprises preparing phosphor gains excitable by light, and forming a glass coating layer on a surface of each phosphor grain. The glass coating layer may be formed by mixing the phosphor grains with a glass composition; heat-treating a mixture of the phosphor grains and the glass composition to make the glass composition melt and surround the phosphor grains; and cooling and breaking the heat-treated mixture to provide phosphors, each comprising the phosphor grain having the glass coating layer formed on a surface of the phosphor grain.

Abstract: The present invention relates to a phosphor and a luminous element using the same. The present invention provides a phosphor for absorbing a portion of light emitted from a light source and emitting light with a wavelength different from that of the absorbed light. The phosphor comprises a fluorescent material having an alkaline earth metal-germanium metal-sulfur structure that contains Ge and at least one element selected from the group consisting of Sr and Ca and is activated by Eu. The phosphor of the present invention increases a color rendering index (CRI) of a white luminous element for a general lighting apparatus, and a luminous element using the phosphor has an advantage in that it is suitable for a white luminous element backlight which can substitute for a cold cathode fluorescent lamp (CCFL) in medium and large-sized TVs and has higher color reproducibility and higher white uniformity.

Abstract: A phosphor is formed with a glass coating layer on a surface of a phosphor grain to have improved moisture and/or thermal stability. A method for manufacturing the phosphor comprises preparing phosphor grains excitable by light, and forming a glass coating layer on a surface of each phosphor grain. The glass coating layer may be formed by mixing the phosphor grains with a glass composition; heat-treating a mixture of the phosphor grains and the glass composition to make the glass composition melt and surround the phosphor grains; and cooling and breaking the heat-treated mixture to provide phosphors, each comprising the phosphor grain having the glass coating layer formed on a surface of the phosphor grain.

Abstract: The present invention provides a light emitting device which comprises blue and red light emitting diode (LED) chips and at least one phosphor for emitting green light by means of light emitted from the blue LED chip, and an LCD backlight including the light emitting device. According to the light emitting device of the present invention, uniform white light can be implemented and both high luminance and wider color reproduction range can also be obtained. Accordingly, an LCD backlight for uniform light distribution on an LCD as well as low power consumption and high durability can be manufactured using the light emitting device.

Abstract: The present invention provides a red phosphor, a method for manufacturing the red phosphor and a light emitting device using the red phosphor, in which the red phosphor is expressed as a chemical formula of (Ca,Sr)1-x-yEuxPbyS, wherein 0.0005?x?0.01 and 0.001?y?0.05. According to the present invention, the red phosphor has improved reliability and luminous efficiency and thus be used to obtain a light emitting device with more excellent color reproducibility and optical characteristic.

Abstract: The present invention relates to a thiogallate phosphor expressed as AB2S4. The thiogallate phosphor of the present invention is configured by replacing a position A where a divalent ion is required with a trivalent element having an ion size similar to that of the element at the position A and with a monovalent element having an ion size similar to that of the element at the position A. Preferably, the trivalent and monovalent elements are replaced by the same amount. Further, the present invention relates to a white light emitting diode and is to manufacture a white light emitting diode with excellent luminous efficiency.

Abstract: The present invention relates to a thiogallate phosphor which is excited by ultraviolet or blue light to emit light with a relatively longer wavelength than that of the ultraviolet or blue light. The phosphor is expressed as a general formula of (A1-x-yEuxMIIIy)(B2-yMIIy)S4, wherein 0.005<x<0.9, 0<y<0.995 and x+y<1. Here, A is at least one element selected from the group consisting of Ba, Sr and Ca, B is at least one element selected from the group consisting of Al, Ga and In, MIII is at least one rare earth element selected from the group consisting of Sc, La, Gd and Lu, and MII is at least one element consisting of Mg, Zn and Be. Accordingly, the luminous efficiency can be increased relative to the thiogallate phosphor with a general formula of AB2S4:Eu.

Abstract: A method of coating phosphor powder with a composite oxide, and a light emitting device that employs the phosphor powder coated with the composite oxide are disclosed. The method includes mixing a silicon oxide precursor and a precursor of another oxide in water and alcohol to form a primary coating layer on a sulfide phosphor through a sol-gel reaction, heat treating the primary coating layer to form a composite oxide layer of the silicon oxide and the other oxide from the primary coating layer. The method improves moisture stability of the sulfide phosphor compared to a sulfide phosphor coated with a single silicon oxide film.